A Review on Development and Validation of Ultra Performance Liquid Chromatography for Estimation of Drug in Pharmaceutical Dosage Form

Total Page:16

File Type:pdf, Size:1020Kb

A Review on Development and Validation of Ultra Performance Liquid Chromatography for Estimation of Drug in Pharmaceutical Dosage Form ejpmr, 2020,7(3), 497-505 SJIF Impact Factor 6.222 EUROPEAN JOURNAL OF PHARMACEUTICAL Review Article Pradnya et al. European Journal of Pharmaceutical and Medical Research AND MEDICAL RESEARCH ISSN 2394-3211 www.ejpmr.com EJPMR A REVIEW ON DEVELOPMENT AND VALIDATION OF ULTRA PERFORMANCE LIQUID CHROMATOGRAPHY FOR ESTIMATION OF DRUG IN PHARMACEUTICAL DOSAGE FORM. Pradnya G. Shelke*, Vijay S. Wakale and Ganesh Y. Dama Department of Quality Assurance, Sharadchandra Pawar College of Pharmacy, Dumbarwadi (Otur), Tal-Junner, Dist- Pune 412409, Maharashtra, India. *Corresponding Author: Pradnya G. Shelke Department of Quality Assurance, Sharadchandra Pawar College of Pharmacy, Dumbarwadi (Otur),Tal-Junner, Dist-Pune 412409, Maharashtra, India. Email Id: [email protected], Article Received on 21/01/2020 Article Revised on 10/02/2020 Article Accepted on 01/03/2020 ABSTRACT In recent years, remarkable technological advances have been made in particle chemistry performance, system optimization, detector design, and data processing and control. When brought together, the individual achievements in each discipline have created a step-function improvement in chromatographic performance ultra performance liquid chromatography (UPLC) is a modern technique which gives a new direction for liquid chromatography. UPLC which enhance mainly three areas of liquid chromatography: speed, resolution, and sensitivity. UPLC system column containing bridged ethylsiloxane / silica hybrid (BEH) structure with fine particle size (less than 1.7 m) is utilized and particle less than 2μm in diameter to acquire better resolution, speed, and sensitivity compared with HPLC. In twenty first centenary pharmaceutical industries are focusing for new ways to in economy and shorten time for development of drugs and drug product. The separation and quantification in UPLC is done under very high pressure (up to 100m pa). As contrast to HPLC, under high pressure it is observed that not any negative influence on analytical column and also other components like time and solvent consumption is less in UPLC. The commence review article is an endeavor to offer pervasive awareness around the development and Validation details about the UPLC and related techniques with the aim on practice to an estimation of medicinal Active agents in the last 10 years. The article also focused on general overview of UPLC. Method development and validation of UPLC method for estimation of drug and drug product. KEYWORDS: Drug, UPLC, HPLC, Resolution, 1. INTRODUCTION The Van Demeter curve governed by an equation with Analytical chemistry could be a field of study that three components shows that the usable flow range for a develops strategies, instruments and methods to get data good efficiency with small diameter particles is much on the composition and nature of matter. It is involved greater than for larger diameters The UPLC has involved with the chemical characterization of matter and the development of a new instrumental system for liquid therefore pharmaceutical analysis covers matter having chromatography, which can take advantage of the pharmaceutical applications.[1] UPLC refers to Ultra separation performance (by reducing dead volumes) and Performance Liquid Chromatography. It improves in 3 consistent with the pressures (about 8000 to 15,000 PSI, areas: activity resolution, speed and sensitivity analysis. compared with 2500 to 5000 PSI in HPLC).[5] Efficiency It uses fine particles and saves time and reduces solvent is proportional to column length and inversely consumption.[2] The UPLC relies on the principal of use proportional to the particle size18. Therefore, the column of stationary section consisting of particles but a pair of can be shortened by the same factor as the particle size μm. The underlying principles of this progress area unit without loss of resolution.[6] The application of UPLC ruled by the van Demeter equation, That is associate resulted in the detection of additional drug metabolites, formula that describes the connection between linear rate superior separation and improved spectral quality.[7] (flow rate) and plate height (HETP or column efficiency). UPLC comes from HPLC.[3] HPLC has been As particle size decreases to less than 2.5 m, there is a the evolution of the packing materials accustomed significant gain in efficiency and it’s doesn’t diminish at impact the separation.[4] increased linear velocities or flow rates according to the Van Deemter equation, common Van Deemter equation. By using smaller H = A + B/u + Cu, particles, speed and peak capacity can be expanded to new limits which is known as Ultra Performance.[8] The www.ejpmr.com 497 Pradnya et al. European Journal of Pharmaceutical and Medical Research typical separation method is of HPLC (High temperatures b) use of monolithic columns. UPLC Performance Liquid Chromatography) with many presents the possibility to extend the utility of advantages like robustness, ease of use, good selectivity conventional HPLC, a widely used separation science. and adjustable sensitivity.[9] Its main limitation is the The ACQUITY UPLC System is the first instrument of want of efficiency compared to gas chromatography or its type to include Intelligent Device Management the capillary electrophoresis due to low diffusion technology.[13,14] coefficients in liquid phase, involving slow diffusion of analytes in the stationary phase.[10] The Van Deemter SMALL PARTICLE CHEMISTRY equation shows that efficiency extent with the use of The potential of the van Deemter equation cannot be smaller size particles but this leads to a rapid increase in fulfilled without smaller particles than those consistently back pressure, while most of the HPLC system can used in HPLC.[15] The design and development of sub-2 operate only up to 378 bars.[11] That is why short mm particles is a significant challenge, and researchers columns filled with particles of about 2 m are used with have been active in this area for some time to capitalize these systems, to accelerate the analysis without loss of on their advantages. Figure 1 shows Van Deemter plot, efficiency, while maintaining an acceptable loss of showing the progress of particle sizes over the last three load.[12] To improve the efficiency of HPLC separations, decades.[16] the following can be done: - a) work at higher Fig 1: Van Deemter plot, illustrating the evolution of particle sizes over the last three decades. Although high potency, non-porous one.5 millimetre These 1.7 millimetre particles derive their increased particles area unit commercially on the market, they mechanical stability by bridging the alkyl teams within suffer from poor loading capability and retention because the silicon oxide matrix. Packing 1.7 millimetre particles of low extent. UPLC must use novel porous particles that into consistent and rugged columns was additionally a can withstand high pressures. Silica based mostly challenge that required to be overcome.[19] In addition, at particles have smart mechanical strength, but can suffer high pressures; frictional heating of the mobile phase can from a number of disadvantages, which include a limited be quite significant and must be considered. With pH range and tailing of basic analytes.[17] In 2000, a column diameters generally employed in HPLC (3.0 to primary generation hybrid chemistry that took advantage 4.6 mm), a consequence of frictional heating is the loss of the simplest of each the silicon oxide and compound of performance due to temperature induced non uniform column worlds was introduced. Producing a classical sol- flow. To minimize the effects of resistance heating, gel synthesis that includes carbon within the style of smaller diameter columns (1–2.1 mm) area unit generally alkyl teams, these columns are mechanically strong, with used for UPLC.[20,21] high efficiency, and operate over an extended pH range.[18] But, so as to supply the sort of increased ADVANTAGES OF UPLC[22,23,24] mechanical stability needed for UPLC, a second Various advantages of UPLC are as follows generation bridged ethane hybrid (BEH) technology was • Decreases run time and increases sensitivity. developed. • Less solvent consumption www.ejpmr.com 498 Pradnya et al. European Journal of Pharmaceutical and Medical Research • Provides the selectivity, sensitivity, and dynamic effects of high pressure. range of LC analysis. In addition, the phases of less than 2 m are generally • UPLC’s fast resolving power quickly quantifies non-re generable and thus have limited use. related and unrelated compounds. • Faster analysis through the use of a novel separation INSTRUMENTATION material of very fine particle size. The schematic diagramme of UPLC and various parts of the instrument are shown in Figure1, and Figure 2, • Assures end-product quality, including final release respectively. testing. • Reduces process cycle times, so that more product Parts of ultra performance liquid chromatography can be produced with existing resources. (UPLC) • Delivers real-time analysis in step with Solvent Reservoir manufacturing processes. Degasser High Pressure Pump DISADVANTAGES OF UPLC Sample Injection Port Due to increased pressure requires more Column maintenance and reduces the life of the columns of Detector these types. So far performances similar or even Data Processing and Control higher have been demonstrated by using stationary Waste phases of size around 2 m without the adverse Fig 2: Schematic diagram of UPLC. Fig. 3: UPLC instrument. Analytical RP-UPLC method development
Recommended publications
  • Synthesis and Applications of Monolithic HPLC Columns
    University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 8-2005 Synthesis and Applications of Monolithic HPLC Columns Chengdu Liang University of Tennessee - Knoxville Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Chemistry Commons Recommended Citation Liang, Chengdu, "Synthesis and Applications of Monolithic HPLC Columns. " PhD diss., University of Tennessee, 2005. https://trace.tennessee.edu/utk_graddiss/2233 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Chengdu Liang entitled "Synthesis and Applications of Monolithic HPLC Columns." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, with a major in Chemistry. Georges A Guiochon, Major Professor We have read this dissertation and recommend its acceptance: Sheng Dai, Craig E Barnes, Michael J Sepaniak, Bin Hu Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) To the Graduate Council: I am submitting herewith a dissertation written by Chengdu Liang entitled, “Synthesis and applications of monolithic HPLC columns.” I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, with a major in Chemistry.
    [Show full text]
  • Reverse-Phase Liquid Chromatography of Small Molecules Using Silica Colloidal Crystals Natalya Khanina Purdue University
    Purdue University Purdue e-Pubs Open Access Theses Theses and Dissertations Fall 2014 Reverse-Phase Liquid Chromatography Of Small Molecules Using Silica Colloidal Crystals Natalya Khanina Purdue University Follow this and additional works at: https://docs.lib.purdue.edu/open_access_theses Part of the Analytical Chemistry Commons Recommended Citation Khanina, Natalya, "Reverse-Phase Liquid Chromatography Of Small Molecules Using Silica Colloidal Crystals" (2014). Open Access Theses. 339. https://docs.lib.purdue.edu/open_access_theses/339 This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact [email protected] for additional information. Graduate School ETD Form 9 (Revised 12/07) PURDUE UNIVERSITY GRADUATE SCHOOL Thesis/Dissertation Acceptance This is to certify that the thesis/dissertation prepared By Natalya Khanina Entitled REVERSE-PHASE LIQUID CHROMATOGRAPHY OF SMALL MOLECULES USING SILICA COLLOIDAL CRYSTALS For the degree of Master of Science Is approved by the final examining committee: Mary J. Wirth Chair Chittaranjan Das Garth J. Simpson To the best of my knowledge and as understood by the student in the Research Integrity and Copyright Disclaimer (Graduate School Form 20), this thesis/dissertation adheres to the provisions of Purdue University’s “Policy on Integrity in Research” and the use of copyrighted material. Approved by Major Professor(s): _______________________________Mary J. Wirth _____ ____________________________________ Approved by: R. E. Wild 11/24/2014 Head of the Graduate Program Date REVERSE-PHASE LIQUID CHROMATOGRAPHY OF SMALL MOLECULES USING SILICA COLLOIDAL CRYSTALS A Thesis Submitted to the Faculty of Purdue University by Natalya Khanina In Partial Fulfillment of the Requirements of the Degree of Master of Science December 2014 Purdue University West Lafayette, Indiana ii ACKNOWLEDGMENTS I would first like to thank my research advisor, Dr.
    [Show full text]
  • 9 – Chromatography. General Topics 1] Explain the Three Major
    9 – Chromatography. General Topics 1] Explain the three major components of the van Deemter equation. Sketch a clearly labeled diagram describing each effect. What is the salient point of the van Deemter equation? Which of the three effects is greatest in analytical GC, and which in LC? Explain why. 1 2] The plate height in chromatography is best described as ____________________ 2 3] Do Harris Chapter 22 problem 28 part a and b (8th ed.) 3 4] Be able to define the following terms: 4 A] Partition coefficient B] Resolution C] Retention Time 5] The plate height in chromatography is best expressed by ______________. 5 a) band broadening / column length b) mobile phase flow rate / column length c) stationary phase volume / column length d) (band broadening)2 / column length e) (mobile phase flow rate)1/2 / column length 6] Resolution in chromatographic separations is expected to increase in the following manner: 6 a) Rs column length b) Rs mobile phase flow rate c) Rs [1 / mobile phase flow rate] d) Rs [column length]2 e) Rs [column length]1/2 Gas Chromatography 7] The major contribution to the band broadening in gas chromatography is ______ 7 8] Choose the true statements. In gas chromatography, capillary columns provide better resolution than packed columns because: 8 A. they have decreased plate heights. B. they don't have band broadening due to the multipath process. (a) A only. (b) B only. (c) Both A and B. (d) Neither A nor B. 9] A GC‐FID analysis was conducted on a soil sample containing pollutant X.
    [Show full text]
  • Reproducibility of Retention Indices Examining Column Type
    Graduate Theses, Dissertations, and Problem Reports 2013 Reproducibility of Retention Indices Examining Column Type Amanda M. Cadau West Virginia University Follow this and additional works at: https://researchrepository.wvu.edu/etd Recommended Citation Cadau, Amanda M., "Reproducibility of Retention Indices Examining Column Type" (2013). Graduate Theses, Dissertations, and Problem Reports. 440. https://researchrepository.wvu.edu/etd/440 This Thesis is protected by copyright and/or related rights. It has been brought to you by the The Research Repository @ WVU with permission from the rights-holder(s). You are free to use this Thesis in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you must obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/ or on the work itself. This Thesis has been accepted for inclusion in WVU Graduate Theses, Dissertations, and Problem Reports collection by an authorized administrator of The Research Repository @ WVU. For more information, please contact [email protected]. Reproducibility of Retention Indices Examining Column Type Amanda M. Cadau Thesis submitted to the Eberly College of Arts and Sciences at West Virginia University in partial fulfillment of the requirements for the degree of Master of Science in Forensic and Investigative Science Suzanne Bell, Ph.D., Chair Glen Jackson, Ph.D. Keith Morris, Ph.D. Department of Forensic and Investigative Science Morgantown, West Virginia 2013 Keywords: Retention Index, Kovats Retention Index, GC/MS, Drugs of Abuse ABSTRACT Reproducibility of Retention Indices Examining Column Type Amanda M.
    [Show full text]
  • Quantitative Thin-Layer Chromatography
    Quantitative Thin-Layer Chromatography A Practical Survey Bearbeitet von Bernd Spangenberg, Colin F. Poole, Christel Weins 1. Auflage 2011. Buch. xv, 388 S. Hardcover ISBN 978 3 642 10727 6 Format (B x L): 15,5 x 23,5 cm Gewicht: 839 g Weitere Fachgebiete > Chemie, Biowissenschaften, Agrarwissenschaften > Analytische Chemie > Instrumentelle Chemische Analytik, Chromatographie Zu Inhaltsverzeichnis schnell und portofrei erhältlich bei Die Online-Fachbuchhandlung beck-shop.de ist spezialisiert auf Fachbücher, insbesondere Recht, Steuern und Wirtschaft. Im Sortiment finden Sie alle Medien (Bücher, Zeitschriften, CDs, eBooks, etc.) aller Verlage. Ergänzt wird das Programm durch Services wie Neuerscheinungsdienst oder Zusammenstellungen von Büchern zu Sonderpreisen. Der Shop führt mehr als 8 Millionen Produkte. Chapter 2 Theoretical Basis of Thin Layer Chromatography (TLC) 2.1 Planar and Column Chromatography In column chromatography a defined sample amount is injected into a flowing mobile phase. The mix of sample and mobile phase then migrates through the column. If the separation conditions are arranged such that the migration rate of the sample components is different then a separation is obtained. Often a target compound (analyte) has to be separated from all other compounds present in the sample, in which case it is merely sufficient to choose conditions where the analyte migration rate is different from all other compounds. In a properly selected system, all the compounds will leave the column one after the other and then move through the detector. Their signals, therefore, are registered in sequential order as a chromatogram. Column chromatographic methods always work in sequence. When the sample is injected, chromatographic separation occurs and is measured.
    [Show full text]
  • 1 Chromatography Problem Set Go Over the Concepts of Partition
    Chromatography Problem Set Go over the concepts of partition coefficient, retention time, dead time, capacity factor, relative retention factor. 1. Retention time can be used to identify a compound in a mixture using gas chromatography. Which one of the following will not affect the retention time of a compound in a gas chromatography column? 1 A. concentration of the compound B. nature of the stationary phase C. rate of flow of the carrier gas D. temperature of the column Questions 2- 4 answer as true or false 2. All analytes in a chromatographic separation spend the same amount of time in the mobile phase. 2 3. Doubling the length of the column doubles the retention time of analytes and doubles the number of theoretical plates. 3 4. Doubling the length of the column doubles the retention time of analytes and doubles the resolution. 4 5. Describe how the “A” term of the van Deemter equation contributes to band broadening.5 6. Describe how the “B/u” term of the van Deemter equation contributes to band broadening. Why is it inversely proportional to mobile phase flow rate? 6 7. Describe how the “Cu” term of the van Deemter equation contributes to band broadening. Why is it directly proportional to mobile phase flow rate? 7 8. The resolution term in chromatographic separations is proportional to ________________8 9. The plate height in chromatography is best described as _________________________9 10. Generally, it is thought by many chromatography dilettantes that twice the column length will give you twice the separation “power”. Comment on why this is false.
    [Show full text]
  • Gas Chromatography Optimization Using Experimental Design and Surface Response Methodology
    List of tables Table 1. Column description ........................................................................................................ 26 Table 2. samples used in the entire project ................................................................................. 26 Table 3. Conditions for programmed temperature pilot experiments ........................................ 29 Table 4. Conditions for isothermal pilot experiments ................................................................. 29 Table 5. Conditions for temperature-programmed experiments on the 007-column ................. 30 Table 6. Conditions for isothermal experiments on the 007-column ......................................... 31 Table 7. average peak asymmetry at ramp rate 25C/min and 05C/min ................................. 36 Table 8. Retention factor obtained from 10m250m0.25m, He as carrier gas, 25 cm/s, isothermal condition. .................................................................................................................. 37 Table 9. A term in three carrier gases within five level of temperature rates and 10, 30 & 60m 40 Table 10 (A, B): Golay models in three carrier gases and different column dimension .............. 64 Table 11. mean VD models calculated from ISO in 10- 60m column length (column 4, Helium, hydrogen and nitrogen as carrier gas) in isothermal gas chromatography. ............................... 70 Table 12. transition efficiency and analysis time in two column temperature condition ......... 71 Table 13. Comparison of
    [Show full text]
  • Three Versus Five Μm Chlorinated Polysaccharide-Based
    Special issue paper Received: 28 June 2013, Revised: 16 September 2013, Accepted: 20 September 2013 Published online in Wiley Online Library: 18 October 2013 (wileyonlinelibrary.com) DOI 10.1002/bmc.3071 Three versus five micrometer chlorinated polysaccharide-based packings in chiral capillary electrochromatography: efficiency and precision evaluation Ans Hendrickx, Katrijn De Klerck, Debby Mangelings, Lies Clincke and Yvan Vander Heyden* ABSTRACT: In an earlier part of this study (performance evaluation) it was observed, for home-made capillary electrochromatography (CEC) columns, that smaller particle diameters do not always generate higher efficiencies. This phenomenon was further examined in this study, evaluating Van Deemter curves. Naphthalene and trans-stilbene oxide were analyzed on four 3 μmand four 5 μm chlorinated polysaccharide-based chiral stationary phases (CSPs) applying voltages ranging from 5 to 30 kV. Neither the 3 nor the 5 μm packings generated systematically the highest efficiencies. The varying column efficiencies were optimized by evaluating nine packing procedures for both 3 and 5 μm CSPs. Again it was observed that smaller particle-size packings were not necessarily beneficial for the efficiency of the CEC analysis. This observation was statistically evaluated. A variability study evaluated different precision estimates related to column packing and replicate measurement conditions. The best columns with the highest efficiencies (for chiral separations) and good precision, that is, the lowest RSD values, were generated by the packing procedure in which an MeOH-slurry and a water rinsing step of 8 h were applied. Copyright © 2013 John Wiley & Sons, Ltd. Keywords: chiral electrochromatography; chlorinated polysaccharide-based selectors; 3 vs 5μm packings fi Introduction diffusion coef cient of the mobile phase and Ds the diffusion coefficient of the stationary phase.
    [Show full text]
  • Appendix 1 Glossary of Chromatographic Terms
    Appendix 1 Glossary of chromatographic terms Definition of chromatography, IUPAC (1993) "Chromatography is a physical method of separation in which the components to be separated are distributed between two phases, one of which is stationary while the other moves in a definite direction." Adjusted retention time t~, also known as corrected retention time, takes into account the dead time tM of the column; see retention time and dead time. t~ = tR - tM Adsorption chromatography mode of separation in which a solute or sample components are attracted to a solid surface, the stationary phase, by adsorp­ tion retention forces, the mobile phase may be a gas or liquid. Adsorption retention forces attraction of a solute onto a solid stationary phase due to microporosity (pores 5~ 50 nm) and polar character (formation of van der Waal's forces and hydrogen bonding) of the surface, described by Langmuir isotherms (see isotherms). Affinity chromatography separation effected by affinity of solute molecules for a bio-specific stationary phase consisting of complex organic molecules bonded to an inert support material, e.g. separation of proteins on a bonded antibody stationary phase. The technique is really selective filtration rather than chromatography. Alumina A120 3, slightly basic adsorbent used in liquid chromatography, particularly TLC, as a less acidic alternative to silica gel. Anion exchange chromatography see ion exchange chromatography. Asymmetry, As term used to describe non-symmetrical peaks measured by obtaining the ratio at 10% peak height h of the forward part, a and the rear part, b of a peak measured from the perpendicular line drawn from the peak maxima to the baseline.
    [Show full text]
  • Chapter 2 15
    Chapter 2 15 Chapter 2 Selectivity in Capillary Electrokinetic Separations [#] [#] This Chapter was published as a review in: T. de Boer, R.A. de Zeeuw, G.J. de Jong and K. Ensing. Electrophoresis, 20 (1999) 2989-3010 16 Chapter 2 Summary This review gives a survey of selectivity modes in capillary electrophoretic separations in pharmaceutical analysis and bioanalysis. Despite the high efficiencies of these separation techniques, good selectivity is required to allow quantitation or identification of a particular analyte. Selectivity in capillary electrophoresis is defined and described for different separation mechanisms, which are divided into two major areas: 1) capillary zone electrophoresis, and 2) electrokinetic chromatography. The first area describes aqueous (with or without organic modifiers) and non-aqueous modes. The second area discusses all capillary electrophoretic separation modes in which interaction with a (pseudo) stationary phase results in a change in migration rate of the analytes. These can be divided in micellar electrokinetic chromatography and capillary electrochromatography. The latter category can range from fully packed capillaries, via open tubular coated capillaries to the addition of microparticles with multiple or single binding sites. Furthermore, an attempt is made to differentiate between methods in which molecular recognition plays a predominant role and methods in which the selectivity depends on overall differences in physicochemical properties between the analytes. The calculation of the resolution for the different separation modes and the requirements for qualitative and quantitative analysis are discussed. It is anticipated that selectivity tuning can be easier in separation modes in which molecular recognition plays a role. However, sufficient attention needs to be paid to the efficiency of the system in that it not only affects resolution but also detectability of the analyte of interest.
    [Show full text]
  • Chromatography What Is Chromatography?
    Chromatography What is chromatography? An analogy which is sometimes useful is to suppose a mixture of bees and wasps passing over a flower bed. The bees would be more attracted to the flowers than the wasps, and would become separated from them. If one were to observe at a point past the flower bed, the wasps would pass first, followed by the bees. In this analogy, the bees and wasps represent the analytes to be separated, the flowers represent the stationary phase, and the mobile phase could be thought of as the air. The key to the separation is the differing affinities among analyte, stationary phase, and mobile phase. The observer could represent the detector used in some forms of analytical chromatography. A key point is that the detector need not be capable of discriminating between the analytes, since they have become separated before passing the detector. - Wikipedia ! Yeah??? History • Russian botanist Mikhail Semyonovich Tsvet invented first chromatographic techniques for separation of pigments from plants • Used calcium carbonate to separate plant pigments. Chromatography • Separation depends on differential partitioning between stationary phase (chromatography media) and mobile phase (buffer solution or gas) • Stationary phase can be packed into a tube • Resin can be mixed in with absorbent material in batch and pour slurry over filter to collect resin • There are many different types of systems depending on the need • Basic systems consist for proteins consist of pump column and detector (UV, IR or light scattering) Stationary
    [Show full text]
  • 1 Lecture 5 Non-Ideal Conditions Gradient Elution
    Equations related to resolution Most of these are directly or indirectly related to k L σ2 tR′ = t R – tM H = = Lecture 5 N L √ Non-ideal conditions tR′ nAnalyte in the stationary phase N k = = Rs = (γ – 1) tM nAnalyte in the mobile phase 4 t′ k B R(B) (B) H = A + + C·u α = = u tR(A)′ k(A) cs 2 (tR(B) – tR(A)) ∆t Kc = Rs = Rs = cm wb(A) + wb(B) wb 2 2 √ tR t′R N α–1 k(B) N = 16 Neff = 16 Rs = wb wb 4 α 1–k(B) AM0925 - Quality parameters and optimization in Chromatography AM0925 - Quality parameters and optimization in Chromatography Equations related to resolution Equations related to resolution If k is not constant: k is not constant under the following conditions: L σ2 tR′ = t R – tM H = = Gradient elution N L Gradually increasing solvent strength and decreasing k ′ n √N tR Analyte in the stationary phase Sample or analyte overload k = = Rs = (γ – 1) t nAnalyte in the mobile phase 4 M The stationary phase changes properties because it is influenced t′ k B by the analyte R(B) (B) H = A + + C·u α = = u tR(A)′ k(A) In adsorption chromatography there may be competition for the stationary phase (saturation) cs 2 (tR(B) – tR(A)) ∆t Kc = Rs = Rs = Multiple retention mechanisms (“active sites”) cm wb(A) + wb(B) wb More than one k per analyte 2 2 t t′ √N α–1 k R R (B) Ad sorption in partition chromatography N = 16 Neff = 16 Rs = wb wb 4 α 1–k(B) AM0925 - Quality parameters and optimization in Chromatography AM0925 - Quality parameters and optimization in Chromatography Equations related to resolution Gradient elution Isothermal (in GC) or isocratic
    [Show full text]